<header nz-row >
  <div >
    <a href="" class='logo'>
      <span>ng-admin</span>
    </a>
    <button nz-button [nzType]="'primary'" (click)="toggleCollapsed()" class='nav_close'>
      <i nz-icon [type]="isCollapsed?'menu-unfold':'menu-fold'"></i>
    </button>
  </div>
</header>
